Entropy changes that are positive (+) indicate more chaos. The entropy of the universe is increasing. The entropy of a universe increases whenever there is any spontaneous change.
What constitutes a positive example of entropy?As the ice melts, the molecules grow disorganised as they are now able to move about. The water is then heated to transform into a gas, releasing the molecules to move freely through space. Both of the above reactions would have a positive entropy (DS).
What are some examples of positive or negative entropy?Positive entropy indicates an increase in randomness in a system. Positive entropy processes include boiling and evaporation. A system has less randomness when the entropy is negative. A few instances of negative entropy processes include freezing and condensation.
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Select the correct location on the image.
The red arrow shows the direction that wind from the South Pole would travel if Earth were not spinning. The wind’s destination is at point A. Because Earth is spinning in the direction shown by the blue arrow, the Coriolis effect will cause the wind to terminate closest to which point?
The graphic shows that whereas southern winds would be redirected to the right, northern wind will be redirected to the left.
How would the Coriolis effect change if the Earth's rotation ceased?The Earth wouldn't appear much like it currently does if it ceased rotating on its axis.The absence of the Coriolis Effect would prevent the spiraling of winds, the enlargement of the equatorial area, and the oceanification of the continents.
Why are the arrows pointing in the different directions for each hemisphere's wind direction?The Coriolis effect is what appears to be a deflection.Fluids that move over wide areas, like air currents, are comparable to the trajectory of a ball.The Northern Hemisphere gives them the appearance of bending to the right.In the Southern Horizon, where currents seem to bend to a left, the Coriolis force behaves in the opposite direction.
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Can you create a single word problem that ask for multiple factors?
A math question that is written as one or more sentences and asks students to use their mathematical understanding to solve an issue from "real world" is known as a word problem.
What is a one word problem?One of the first applications of math that we encounter are word problems. Many grade school students find word problems to be the most stressful type of math problem. A great selection of word problems for each of the four fundamental math operations can be found on this page.
There are word problems for addition, subtraction, multiplication, and division. Each type of problem starts out simple and straightforward and progresses to require more complex reasoning—a skill that is required on many standardized tests. Along the way, students will encounter a variety of operations that call for them to determine the kind of story problem they must resolve.
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A plane has a takeoff speed of 34 m/s. What acceleration is needed for it to effectively use a 275 m runway?
Answer: the acceleration needed will be 2.1 m/s²
Physics WebAssign Project. Work would be awesome if you could send that too!
a). Fe*cos32 = 799 N.
Fe = 799 / cos32 = 948 N. = Force exerted.
b). W = Fe * d = 948 * 22 = 20,856 J.
c). P = W / t = 20,656 / 8 s. = 2607 J/s
= 2607 Watts = 2.607 KW.
What is the formula for horizontal force?A horizontal force is one that moves in a path perpendicular to the sky. The magnitude and direction of the horizontal forces are both equivalent. The horizontal net force is zero because they are symmetrical. The absence of horizontal motion is indicated by this. Equal in magnitude and moving in the opposing direction are the vertical forces.
The normal force on a horizontal surface is an illustration of any item maintained on a horizontal surface, such as a flat table, a stand, or just the earth. Keeping literature on a bookshelf or computers on a desk at work are two examples. Gravitational force is measured in g.
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A tank of cross-sectional area A, discharges water through an orifice of area A₂ at the bottom of the tank at a steady rate. If the density of the water is o, find the mass flow rate of water from the tank. Now, if a pipe of area A2 and length H/2 is attached to the orifice, what is the increase in the flow rate? Find the pressure at point C for the two cases. (Atmospheric pressure = Po, assuming point C is just outside the tank whose cross-sectional area is A₁.)
Answer:
The mass flow rate of water from the tank can be found using the Bernoulli's equation which states that the total energy of a fluid remains constant along a streamline. Applying Bernoulli's equation between the surface of the water in the tank and the orifice at the bottom, neglecting the height difference, we get:
P/ρ + gh + 1/2 * V^2 = P₂/ρ + 1/2 * V₂^2
where P is the pressure at the surface of the water in the tank, ρ is the density of water, g is the acceleration due to gravity, h is the height of the water surface above the orifice, V is the velocity of water at the surface of the water in the tank, P₂ is the pressure at the orifice, and V₂ is the velocity of water at the orifice. Since the orifice is at the bottom of the tank, h is zero, and V₂ is the velocity of water discharging from the orifice, which can be calculated using the continuity equation:
A₁V = A₂V₂
where A₁ is the cross-sectional area of the tank, and V is the velocity of water at the surface of the water in the tank.
Combining these equations and solving for the mass flow rate, we get:
m_dot = A₂ * sqrt(2 * ρ * (P - P₂))
Now, if a pipe of area A₂ and length H/2 is attached to the orifice, the velocity of water at the end of the pipe will be different than the velocity of water discharging from the orifice. We can use the Bernoulli's equation again between the orifice and the end of the pipe to calculate the velocity of water at the end of the pipe:
P₂/ρ + 1/2 * V₂^2 = P₃/ρ + gh + 1/2 * V₃^2
where P₃ is the pressure at the end of the pipe, and V₃ is the velocity of water at the end of the pipe. Again, neglecting the height difference, we get:
P₂/ρ + 1/2 * V₂^2 = P₃/ρ + 1/2 * V₃^2
Since the pipe is attached to the orifice, the pressure at the end of the pipe is atmospheric pressure Po, and the velocity of water at the end of the pipe can be calculated using the continuity equation:
A₂V₂ = A₃V₃
where A₃ is the cross-sectional area of the pipe.
Combining these equations and solving for the increase in mass flow rate, we get:
Δm_dot = A₃ * sqrt(2 * ρ * (P₂ - Po))
To find the pressure at point C for the two cases, we need to apply the Bernoulli's equation between the surface of the water in the tank and point C. Neglecting the height difference again, we get:
P/ρ + 1/2 * V^2 = Pc/ρ + 1/2 * Vc^2
where Pc is the pressure at point C, and Vc is the velocity of water at point C. For the first case, where the pipe is not attached to the orifice, we can assume that the velocity of water at point C is negligible, i.e., Vc = 0. Solving for Pc, we get:
Pc = P - 1/2 * ρ * V^2
For the second case, where the pipe is attached to the orifice, we can assume that the velocity of water at point C
The roche limit is reached when: question 6 options: 1) the internal pressure of a gas giant planet is enough to compress its core. 2) ring particles closest to a planet fall into its atmosphere. 3) the tidal stress becomes greater than the surface gravity. 4) a ring particle reaches escape velocity
Option 2 is the correct answer. The Roche limit is reached when ring particles closest to a planet fall into its atmosphere.
The Roche limit is the minimum distance at which a celestial body, such as a moon or a ring system, can approach a planet before being disrupted by tidal forces. When a celestial body gets too close to a planet, the planet's tidal forces can overcome its gravitational pull, and the body may be torn apart by these forces.
Option 2 is the correct answer. The Roche limit is reached when ring particles closest to a planet fall into its atmosphere. This happens because the tidal forces from the planet become stronger than the gravitational forces holding the particles together, causing them to break apart and fall towards the planet. Once the particles are within the Roche limit, they will continue to break apart and eventually form a disk or ring around the planet.
The Roche limit is an important concept in planetary science, as it helps us understand the structure and behavior of planets, moons, and other celestial bodies. It can also help us explain the formation of planetary rings, such as those around Saturn and other gas giants in our solar system.
So, the right response is Choice 2. When ring particles closest to a planet enter its atmosphere, the Roche limit is achieved.
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what is a electric circuit? mention their major components of a circuit with their role.
The principle of superposition states that if two functions each separately satisfy the wave equation, then the sum (or difference) also satisfies the wave equation. This principle follows from the fact that every term in the wave equation is linear in the amplitude of the wave. Consider the sum of two waves y_1 (x, t) + y_2 (x, t), where y_1 (x, t) is the wave described in Part A and y_2 (x, t) is the wave described in Part B. These waves have been chosen so that their sum can be written as follows: This form is significant because y_e (x), called the envelope, depends only on position, y_t (t) depends only on time. Traditionally, the time function is taken to be a trigonometric function with unit amplitude; that is, the overall amplitude of the wave is written part of y_e (x). Find y_e (x) and y_t (x). Keep in mind that y_1 (t) should be a trigonometric function of unit amplitude. Which one of the following statements about the superposition wave y_s (x, t) is correct? This wave is traveling in the +x direction. This wave is traveling in the x direction. This wave is oscillating but not traveling.
The correct statement is "This wave is oscillating but not traveling."
The principle of superposition states that if two functions each separately satisfy the wave equation, then the sum (or difference) also satisfies the wave equation.
This principle follows from the fact that every term in the wave equation is linear in the amplitude of the wave.
In this case, the sum of two waves y_1 (x, t) + y_2 (x, t) can be written as y_s (x, t) = y_e (x) * y_t (t), where y_e (x) is the envelope function that depends only on position and y_t (t) is the time function that depends only on time.
To find y_e (x) and y_t (t), we need to separate the position and time dependence of the sum wave y_s (x, t). Since y_1 (x, t) and y_2 (x, t) are both trigonometric functions with unit amplitude, we can write them as:
y_1 (x, t) = A_1 * cos(k_1 * x - omega_1 * t)
y_2 (x, t) = A_2 * cos(k_2 * x - omega_2 * t)
The sum of these two waves is:
y_s (x, t) = A_1 * cos(k_1 * x - omega_1 * t) + A_2 * cos(k_2 * x - omega_2 * t)
Using the trigonometric identity for the sum of two cosines, we can write this as:
y_s (x, t) = (A_1 + A_2) * cos((k_1 + k_2) * x / 2 - (omega_1 + omega_2) * t / 2) * cos((k_1 - k_2) * x / 2 - (omega_1 - omega_2) * t / 2)
The first cosine term depends only on position and the second cosine term depends only on time, so we can write:
y_e (x) = (A_1 + A_2) * cos((k_1 + k_2) * x / 2)
y_t (t) = cos((omega_1 - omega_2) * t / 2)
Therefore, the envelope function y_e (x) and the time function y_t (t) are:
y_e (x) = (A_1 + A_2) * cos((k_1 + k_2) * x / 2)
y_t (t) = cos((omega_1 - omega_2) * t / 2)
Regarding the statement about the superposition wave y_s (x, t), the correct statement is "This wave is oscillating but not traveling."
This is because the envelope function y_e (x) depends only on position and the time function y_t (t) depends only on time, so the wave is not traveling in any direction.
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Analyze and Extend
Now that you've observed some properties of reflection and absorption of light, answer some questions based on
data from Hector's investigations.
Part A
Were the predictions you made in the beginning of this activity correct?
Answer:
All the colours in the white light are absorbed but red and blue colours are reflected because the object's colours are red and blue
Determine the power consumed by the resistor
The power dissipated is 225 W
What is the power consumed by the resistor?The power can also be calculated using the formula:
P = V^2 / R
where V is the voltage in volts (V).
To calculate the power consumed by a specific resistor, you will need to know either the current flowing through the resistor or the voltage across it, as well as the resistance value.
Once you have this information, simply plug in the values into one of the formulas above to calculate the power consumed by the resistor.
We have the total resistance as;
1/RT = 1/15 + 1/20 + 1/25 + 1/10
1/RT = 0.257
RT = 4 ohm
Power = V2/R
Power = (30)^2/4
= 225 W
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You have a convex lens. A candle is located 7.0 cm from the lens. The image of the candle appears at a distance 48 cm from the lens. What is the focal length of the lens?
Answer:
Using the thin lens equation, we have:
1/f = 1/d_o + 1/d_i
where f is the focal length of the lens, d_o is the distance of the object from the lens, and d_i is the distance of the image from the lens.
Plugging in the given values, we get:
1/f = 1/7 + 1/48
Simplifying this expression, we get:
1/f = 0.2024
Multiplying both sides by f, we get:
f = 4.94 cm
Therefore, the focal length of the convex lens is 4.94 cm.
Answer:
6.1 cm
Explanation:
The focal length of the lens is 6.1 or 6.11 cm
A.9 kg toy car has a momentum of 5 kg*m/s. What is the car's speed?
Explanation:
A.9 kg toy car has a momentum of 5 kg*m/s. What is the car's speed?
The momentum of an object is defined as the product of its mass and velocity:
p = m * v
where p is the momentum, m is the mass, and v is the velocity.
To find the car's speed, we can rearrange this equation to solve for v:
v = p/m
Substituting the given values, we get:
v = 5 kg*m/s / 9 kg
v ≈ 0.56 m/s
Therefore, the speed of the car is approximately 0.56 m/s.
a 2.0-m rope is lying on a table. you pick up one end and start raising it vertically. how high above the table is the center of mass (or center of gravity) of the rope when half of the rope has lifted off the table?
Assuming that the rope has uniform density and thickness, the center of mass of the rope will be at its geometric center. When half of the rope has lifted off the table, it means that the lifted portion is 1 meter long, and the remaining portion still lies on the table.
Thus, the center of mass of the lifted portion will be at its midpoint, which is at a distance of 0.5 meters from the end you are holding. Similarly, the center of mass of the remaining portion still lying on the table will also be at its midpoint, which is also at a distance of 0.5 meters from the end you are holding. Therefore, the center of mass of the entire rope will be at the midpoint of the lifted portion and the remaining portion, which is at a distance of 1 meter from the end you are holding. Thus, when half of the rope has lifted off the table, the center of mass of the rope will be 1 meter above the table.
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How far, in terms of wavelength, does a wave travel in one period?
Answer: One
Explanation:
Time period is the time taken by a wave to travel between two consecutive crests or troughs. So, in one time period, a wave travels a distance of one wavelength.
Burl and paul have a total weight of 1300 n. The tensions in the ropes that support the scaffold they stand on add to 1700 n. The weight of the scaffold itself must be
The weight of the scaffold is 400 N.
Let's assume the weight of the scaffold is W. Then we can write an equation based on the information given in the problem:
Burl's weight + Paul's weight + Scaffold's weight = Total weight
or
B + P + W = 1300 N ...(1)
We also know that the tensions in the ropes that support the scaffold add up to 1700 N. This means that the weight of the scaffold and the two men must be equal to the tensions in the ropes:
B + P + W = Tension in ropes
or
B + P + W = 1700 N ...(2)
We can solve these two equations simultaneously to find the weight of the scaffold:
Subtracting equation (1) from equation (2), we get:
Tension in ropes - Total weight = W
or
1700 N - 1300 N = W
or
W = 400 N
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wo substances, one a gas and the other a liquid, are initially at the same temperature, but are liquid contained in two separate, rigid, thermally insulated containers. a) From the information given, can you specify for which substance the average molecular kinetic energy is greater? Note, you are comparing the average kinetic energy in a solid/liquid (there is only one kind) to the average translational kinetic energy in a gas. b) From the information given, can you specify for which substance the average speed is greater? If not, what additional information would you need? Explain/justify your answer using appropriate components of the Particle Model of Thermal Energy and/or previous Models we have used.
The average molecular kinetic energy of the liquid will be greater than the average translational kinetic energy of the gas due to the fact that liquid molecules are much closer together than gas molecules and thus experience a greater force of attraction between them. This force of attraction reduces the total kinetic energy of the liquid molecules, resulting in an average molecular kinetic energy that is greater than that of the gas.
In terms of the average speed, it is impossible to determine which substance has a greater average speed from the information given. We would need to know the temperature of the containers and the number of molecules of each substance in order to calculate the average speed of each. This is because the average speed is dependent on the temperature of the system, which affects the kinetic energy of the particles, and the number of molecules present, which affects the ratio of molecules moving at different speeds.
Therefore, in order to accurately compare the average speed of the two substances, we would need to know the temperature of the containers, the number of molecules of each substance present, and the mass of the molecules. With this additional information, we could then use the Kinetic Theory of Gases to calculate the average speed of each substance.
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what is the voltage output (in v) of a transformer used for rechargeable flashlight batteries, if its primary has 510 turns, its secondary 8 turns, and the input voltage is 125 v?
The voltage output (in V) of a transformer used for rechargeable flashlight batteries, if its primary has 510 turns, its secondary 8 turns, and the input voltage is 125 V is 7.8 V.
A transformer is a device that is used to transfer electrical energy from one electrical circuit to another using electromagnetic induction. It's made up of two or more windings wound over a magnetic core. It has two coils, primary and secondary, that are wound around a magnetic core to create mutual induction.
According to Faraday's law of electromagnetic induction, the voltage induced in the secondary coil of the transformer is proportional to the number of turns in the secondary coil. Therefore, the voltage induced in the secondary coil can be calculated as follows:
Voltage induced in the secondary coil = (number of turns in the secondary coil/number of turns in the primary coil) × input voltage
Voltage induced in the secondary coil = (8/510) × 125 V = 1.96 V × 4 = 7.8 V
Therefore, the voltage output (in V) of a transformer used for rechargeable flashlight batteries, if its primary has 510 turns, its secondary 8 turns, and the input voltage is 125 V is 7.8 V.
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It takes you 7. 0 m to brake to a panic stop from a speed of 9. 0 m/s
Using the same acceleration, how far do you go as you brake to a panic stop from a speed of 29 m/s?
Express your answer with the appropriate units (Value, Units)
The distance required to brake to a panic stop is given by the equation: d = v^2 / 2a
Where d is the distance, v is the initial velocity, and a is the acceleration. For the first situation, we have: v = 9.0 m/s, a = -9.0 m/s^2 (assuming a constant acceleration), d = v^2 / 2a = 9.0^2 / 2(-9.0) = 4.5 m. For the second situation, we have: v = 29 m/s, a = -9.0 m/s^2, d = v^2 / 2a = 29^2 / 2(-9.0) = 45.5 m. Therefore, the distance required to brake to a panic stop from a speed of 29 m/s is 45.5 meters.
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While scuba diving, Joseph rose directly toward the water's surface at a constant velocity for 1. 2minutes. In that time, he rose 5. 4meters, and he was passed by a jackfish swimming south at 15 meters per minute. What was Joseph's velocity?
Joseph's velocity was 4.5 meters per minute
Velocity is the rate of change of displacement of an object with respect to time, and it is measured in units of distance per unit time. Velocity is a physical quantity that describes the rate at which an object changes its position. It is a vector quantity, which means it has both magnitude
We can start by using the formula:
velocity = distance / time
Joseph's velocity can be calculated by dividing the distance he rose by the time it took him:
Substitute the values in the equation
velocity = 5.4 meters / 1.2 minutes
Simplifying this expression, we get:
Velocity = 4.5 meters per minute
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A certain alcohol has a specific heat of 0.57 cal/g°C and a melting point of -114°C. You have a 150 g cup of liquid alcohol at 22°C and then you drop a 10 g frozen piece of alcohol at -11°C into it. After some time the alcohol cube has melted and the cup has come to a common temperature of 7°C. What is the latent heat of fusion( i.e. the “L” in the Q = mL equation) for this alcohol?
Answer:
First, we need to calculate the amount of heat transferred when the frozen piece of alcohol melts and then heats up to the final temperature.
The heat transferred, Q, can be calculated using the formula:
Q = mcΔT
where:
m = mass of the frozen alcohol (10 g)
c = specific heat of the alcohol (0.57 cal/g°C)
ΔT = change in temperature (7°C - (-11°C) = 18°C)
Q = (10 g)(0.57 cal/g°C)(18°C) = 102.6 cal
Next, we need to calculate the amount of heat released by the liquid alcohol as it cools from 22°C to 7°C.
The heat released, Q, can be calculated using the formula:
Q = mcΔT
where:
m = mass of the liquid alcohol (150 g)
c = specific heat of the alcohol (0.57 cal/g°C)
ΔT = change in temperature (22°C - 7°C = 15°C)
Q = (150 g)(0.57 cal/g°C)(15°C) = 128.25 cal
Since the heat released by the liquid alcohol (128.25 cal) is greater than the heat absorbed by the frozen alcohol (102.6 cal), we can assume that the excess heat released by the liquid alcohol is due to the latent heat of fusion of the frozen alcohol.
The latent heat of fusion (L) can be calculated using the formula:
L = Q/m
where:
Q = excess heat released by the liquid alcohol (128.25 cal - 102.6 cal = 25.65 cal)
m = mass of the frozen alcohol (10 g)
L = 25.65 cal / 10 g = 2.565 cal/g
Therefore, the latent heat of fusion for this alcohol is 2.565 cal/g.
treating the earth as a perfect sphere, show that the field strength at the earth's surface is around 9.8NkG*-1
Answer:
F = M g gravitational force on M
M g = G M m / R^2
g = G m / R^2 where R is radius of earth and m the mass
g = 6.67E-11 N-m^2/ kg^2 * 5.98E24 kg / (6.37E6 m)^2
g = 6.67 * 5.98 / (6.37)^2 * 10 = 9.83 m/s^2
The giant swing at a county fair consists of a vertical central shaft with a number of horizontal arms attached at its upper end. Each arm supports a seat suspended from a cable 5. 00 m long, the upper end of the cable being fastened to the arm at a point 3. 00 m from the central shaft
We can examine the motion of the enormous swing at the county fair and figure out the tension in the rope using the concepts of circular motion and energy conservation.
The giant swing at a county fair consists of a vertical central shaft with a number of horizontal arms attached at its upper end. Each arm supports a seat suspended from a cable 5.00 m long, the upper end of the cable being fastened to the arm at a point 3.00 m from the central shaft.
To analyze the motion of the swing, we can use the principles of circular motion. When the swing is in motion, the seat and the person on it move in a circular path around the central shaft.
The tension in the cable is what keeps the seat suspended and provides the necessary centripetal force to keep it moving in a circular path. The magnitude of the tension can be found using the equation:
Tension = (mass x velocity^2) / radius
In this case, the mass of the person on the swing does not affect the tension in the cable, so we can ignore it. The radius of the swing is the length of the cable, which is 5.00 m. The velocity of the swing can be found using the principles of conservation of energy:
Initial potential energy = final kinetic energy
mgh = (1/2)mv^2
where m is the mass of the person, g is the acceleration due to gravity, h is the initial height of the person, and v is the final velocity of the person.
Solving for v, we get:
v = sqrt(2gh)
where h is the initial height of the person above the lowest point of the swing.
Once we know the velocity, we can use the equation for tension to find the tension in the cable.
Therefore, by using the principles of circular motion and conservation of energy, we can analyze the motion of the giant swing at the county fair and determine the tension in the cable.
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The Giant Swing at a county fair consists of a vertical central shaft with a number of horizontal arms attached at its upper end. Each arm supports a seat suspended from a cable 5.00 m long, the upper end of the cable being fastened to the arm at a point 3.00 m from the central shaft.
A) Find the time of one revolution of the swing if the cable supporting a seat makes an angle of 30 degrees with the vertical?
B) Does the angle depend on the weight of the passenger for a given rate of revolution?
Wavelength multiplied by frequency equals
a. Force.
b. Power.
c. Speed.
d. Weight
The equation "wavelength multiplied by frequency equals" is known as the wave equation and is often written as:
λν = c, where λ is the wavelength of a wave, ν is the frequency of the wave, and c is the speed of light. Therefore, the correct answer is (c) Speed. The wave equation relates the fundamental properties of a wave, which are its wavelength, frequency, and speed. The speed of a wave depends on the properties of the medium through which it is traveling, and in the case of electromagnetic waves like light, it travels at a constant speed in a vacuum, denoted by the symbol "c." The wave equation is a fundamental relationship in physics and is used to describe a wide range of phenomena, from the behavior of light and sound waves to the properties of quantum particles.
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a team of students Builds an electrical circuit with a battery and a fan in one to two sentences describe how energy is changed from one form to another in their electric circuit
Energy from the battery is changed into electrical energy, which is then used to power the fan and create kinetic energy as the blades spin.
Connection of an electric circuitIn an electric circuit, energy is changed from one form to another. When a battery is connected to a fan, energy from the battery is changed into electrical energy. This electrical energy is then used to power the fan and create kinetic energy, or energy of motion, as the blades spin.
The energy from the battery is stored in the form of chemical energy. This chemical energy is then changed into electrical energy, which is the energy required to power the fan. This electrical energy passes through the fan, causing the blades to spin. As the blades spin, kinetic energy is generated in the form of the movement of the blades.
The energy in the electric circuit is constantly changing from one form to another. The battery converts chemical energy into electrical energy, and the fan converts electrical energy into kinetic energy. This is the process of energy transformation, which allows us to convert energy from one form to another in order to use it to power appliances.
The electric circuit created by the students is a simple way to illustrate this process of energy transformation. The battery provides the initial source of energy, which is then converted into electrical energy. This electrical energy is then used to power the fan and create kinetic energy. This kinetic energy is then used to move the fan
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Answer:
Energy from the battery is changed into electrical energy, which is then used to power the fan and create kinetic energy as the blades spin.
Connection of an electric circuit
Explanation:
A person weighing 600 N gets on an elevator. The elevator lifts the person 6 meters in 10 seconds. How much work did the elevator do?
Explanation:
To calculate the work done by the elevator, we need to use the formula:
Work = Force x Distance x cos(theta)
Where:
Force = the weight of the person, which is 600 N
Distance = the vertical distance the elevator lifts the person, which is 6 meters
theta = the angle between the force and the direction of movement, which is zero since the force is acting in the same direction as the movement of the elevator (thus, cos(theta) = 1)
Plugging in the values, we get:
Work = 600 N x 6 m x cos(0) = 3600 J
Therefore, the elevator did 3600 Joules of work lifting the person.
Sliding off a sphere A small mass rests on top of a fixed frictionless sphere of radius R. The mass is given a tiny kick and slides downward. At what vertical height does it lose contact with the sphere? Hint: This problem brings together various aspects from this unit. Use conservation of mechanical energy, and also, consider the normal force on the puck. At what value of this normal force does the puck leave the sphere?
When the puck has descended to a height of R/2, it no longer makes touch with the sphere.
To solve this problem, we can use the conservation of mechanical energy. Initially, the mass is at rest and has only potential energy, which is given by mgh, where m is the mass of the puck, g is the acceleration due to gravity, and h is the height of the puck above the ground. When the puck slides down the sphere, it loses potential energy and gains kinetic energy, which is given by [tex](\frac{1}{2}mv^2)[/tex], where v is the velocity of the puck. However, as the puck slides down the sphere, it also experiences a normal force from the sphere, which reduces the force of gravity and affects the speed of the puck.
Let's start by finding the normal force on the puck. At the top of the sphere, the normal force is equal to the weight of the puck, which is mg. As the puck slides down the sphere, the normal force decreases until it reaches zero when the puck loses contact with the sphere. At this point, the gravitational force is equal to the centrifugal force, which is mv^2/R, where R is the radius of the sphere.
Setting these forces equal, we get:
[tex]mg = \frac{mv^2}{R}[/tex]
Simplifying, we get:
[tex]v^2 = gR[/tex]
Now we can use conservation of mechanical energy to find the height at which the puck loses contact with the sphere. At this point, all the potential energy has been converted into kinetic energy, so we have:
[tex]mgh = (\frac{1}{2})mv^2[/tex]
Substituting [tex]v^2 = gR[/tex], we get:
[tex]h = R(1 - \frac{1}{2}) = \frac{R}{2}[/tex]
Therefore, the puck loses contact with the sphere when it has fallen to a height of R/2.
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a sphere of radius r starts from rest and rolls without slipping along a curved surface, dropping through a vertical distance of 0.697 m. find the final speed v of the sphere's center of mass.
The final speed of the sphere's center of mass is approximately 2.72 m/s.
Using conservation of energy to find the final speed v of the sphere's center of mass.
At the beginning, the sphere has only potential energy, and at the end, the sphere has only kinetic energy.
The work done by friction (rolling without slipping) is equal to the change in kinetic energy.
The potential energy at the beginning is:
[tex]U = mgh[/tex]
where m is the mass of the sphere,
g is the acceleration due to gravity, and
h is the vertical distance the sphere drops, which is 0.697 m.
The kinetic energy at the end is:
[tex]K = (1/2)mv^2[/tex]
where v is the final speed of the sphere's center of mass.
The work done by friction is:
[tex]W = K - U[/tex]
The work done by friction is negative, since it acts against the motion of the sphere. For a sphere rolling without slipping, the work done by friction is:
[tex]W = -(7/10)mgd[/tex]
where d is the distance the center of mass has dropped, which is equal to h/2 in this case.
Setting these two expressions for W equal to each other, we have:
[tex]K - U = -(7/10)mgd[/tex]
[tex](1/2)mv^2 - mgh = -(7/10)mg(h/2)[/tex]
Simplifying and solving for v, we get:
[tex]v = \sqrt{(10gh/7)}[/tex]
Plugging in the given values, we have:
[tex]v = \sqrt{(10 * 9.81 * 0.697 / 7)}[/tex]
[tex]v \approx 2.72 m/s[/tex]
Therefore, the final speed of the sphere's center of mass is approximately 2.72 m/s.
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At what temperature will the Kelvin scale reading be double the Fahrenheit scale reading?
a) 250K
b) 353.4K
c)500K
d)30.5k
please show with steps :'(
Answer:
The temperature at which the Kelvin scale reading is double the Fahrenheit reading is 176.69 F = 353.38 K
Explanation:
K = 2F
→ 2F = 273 + (5/9)(F - 32)
→ 18F = 2457 + 5F - 160
→ 18F - 5F = 2457 - 160
→ 13F = 2297
→ F = 2297/13
→ F = 176.69° F
K = 2F
→K = 2 * 176.69
→ K = 353.38K
Mission MC2: Impulse and Momentum Change
A 6.0-kg object moving at 3.0 m/s encounters a 40-
Newton resistive force over a duration of 0.20
seconds. The final momentum of this object is ___kg• m/s
. m/s.
a. - 5.0
b. 0.444
c. 0.50
d. 2.22
e. 8.0
f. 10
g. 11
h. 15
i. 18
j. 26
k. 90
I. 200
Answer:
8.0 I mean for 10, 10 is wrong
Explanation:
Multiplying the force on the object by the time over which the force acts, multiplying the mass of the object by the velocity change of the object
Answer:
[tex]10\; {\rm kg \cdot m\cdot s^{-1}}[/tex].
(Assume that there are no other unbalanced force on this object.)
Explanation:
When an object of mass [tex]m[/tex] travels at a velocity of [tex]v[/tex], the momentum [tex]p[/tex] of that object would be [tex]p = m\, v[/tex].
In this question, the [tex]m = 6.0\; {\rm kg}[/tex] object was initially at a velocity of [tex]v = 3.0\; {\rm m\cdot s^{-1}}[/tex]. The initial momentum of this object would be:
[tex]\begin{aligned} p &= m\, v \\ &= (6.0\; {\rm kg})\, (3.0\; {\rm m\cdot s^{-1}}) = 18\; {\rm kg\cdot m\cdot s^{-1}}\end{aligned}[/tex]
The question states that the external force is "resistive". In other words, this force opposes the motion of this object. Hence, while the magnitude of this force is [tex]40\; {\rm N}[/tex], the vector value of this force would be [tex](-40)\; {\rm N}[/tex].
To find the impulse [tex]P[/tex] that a force [tex]F[/tex] has exerted, multiply the force vector by the duration [tex]\Delta t[/tex] over which this force was applied.
For example, the [tex](-40)\; {\rm N}[/tex] force in this question was applied over a period of [tex]\Delta t = 0.20\; {\rm s}[/tex]. This force would have exerted an impulse [tex]J[/tex] of:
[tex]\begin{aligned}J &= F\, \Delta t \\ &= (-40\; {\rm N})\, (0.20\; {\rm s}) = (-8.0)\; {\rm N\cdot s}\end{aligned}[/tex].
Note that [tex]1\; {\rm N}[/tex] is equivalent to [tex]1\; {\rm kg\cdot m\cdot s^{-2}}[/tex]. Therefore, the unit of impulse [tex]{\rm N\cdot s}[/tex] would be equivalent to [tex]{\rm (kg\cdot m\cdot s^{-2})\cdot s}[/tex], which simplifies to [tex]{\rm (kg\cdot m\cdot s^{-1})}[/tex].
Thus, the impulse on this object [tex](-8.0)\; {\rm N\cdot s}[/tex] would be equivalent to [tex](-8.0)\; {\rm kg\cdot m\cdot s^{-1}}[/tex].
The total impulse on an object is also equal to the change in the momentum of the object. Assuming that there are no other unbalanced force on this object, the total impulse on this object would be [tex](-8.0)\; {\rm kg\cdot m\cdot s^{-1}}[/tex]. The momentum of this object would become:
[tex]\begin{aligned}& 18.0\; {\rm kg \cdot m\cdot s^{-1} + (-8.0)\; {\rm kg\cdot m\cdot s^{-1}} \\ =\; & 10\; {\rm kg\cdot m\cdot s^{-1}} \end{aligned}[/tex].
Determine the power developed by a man with a mass of 110 kilograms who climbs a rope at a * 1 point
constant speed of 2.5 meters per second.
The power developed by a man who climbs a rope at a constant speed can be calculated using the following formula:
power = force x velocity
The force required to lift the man’s weight can be calculated using the formula:
force = mass x gravity
where mass is the man’s mass and gravity is the acceleration due to gravity (9.8 m/s²).
force = 110 kg x 9.8 m/s² = 1078 N
The power developed by the man can then be calculated as:
power = force x velocity = 1078 N x 2.5 m/s = 2695 W
Therefore, the power developed by the man is 2695 W.
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